New Central Heating System-is it air?

Question

Recently had a full heating system put in, oil boiler, vented system, rads upstairs, UFH downstairs. 

System is losing pressure, plumbers have come back once and vented it and reset everything, a week later no pressure again. 

I have topped it up from filling loop, bled all rads. UFH is working fine. 

Can’t see any leaks, when I was filling up PRV was releasing air, but now I am stuck.

Rads cold, slightly luke warm hot water, plumbers say air just needs to work its way through system. 

Any help to either push air quickly or get some heat into rads would be greatly appreciated

Brad · Accepted Answer

Hi Pete does the system have automatic air valves fitted ? At high. Level ? Might be worth while getting a couple fitted on pipework where possible would help to speed things up thanks

Scott · Answer

Is the PRV fully closing also try shutting all rads off leave 1 open once hot then open another ect see if that helps

Lee · Answer

Hi Pete,

Sorry to here this but try the  prv  it could be letting by
Hence the reason you keep losing pressure and it’s 
not visable  only when you discharge it  manually.
Hope this helps out

Regards 
Lee

Andrew · Answer

Underfloor leaks are common on normal radiator system where there are floorboard on the ground floor.
If possible isolate off what parts of the system you can.
I the problem continues i would look to isolate off the UFH, then take it from there if preesure drops are still happening.

Stuart · Answer

UFH can hold massive amounts of air if the installers flushed it through properly this should be cut down to a minimum if they didn’t it can take years to get it all out.

Glenn · Answer

Switch off all the rads and then switch them on individually and bleed them. Remembering to top the system up

Lee · Answer

I’d it’s a vented system, you would have a feed and expansion tank in the loft, which would fill your central heating system via gravity and it would not be pressurised. Would be just the weight of water in the system, there wouldn’t be a filling loop. I’m guessing that it’s either been converted or it’s vented hot water.  But by the sounds lf it I think your prv is releasing water probably for a bit of grit stuck in there which would slowly release your praise and start to empty the system. Check to see if it’s dripping after you have re pressured the system.

Gareth · Answer

Did your plumbers totally re-pipe the whole central heating pipework ?
if they didnt then this could be the reason you are losing pressure , especially as it is vented 
To be honest i am surprised you havent gone for a fully pressurised system

New Central Heating System-is it air?

Follow Us

Cookies

Manage Cookies

Essential cookies

Analytics & Tracking

Advertising